Weak consolidation large pore channel treatment system as well as preparation method and application thereof

A technology with large pores and solidity, which is used in solid waste management, chemical instruments and methods, and production of fluids. , the effect of high blocking strength

Pending Publication Date: 2022-07-12
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a weakly consolidated large pore management system and its preparation method and application in view of the insufficient strength of the organic gel system to block the large pores and the risk of blocking the cement inorganic solidification system in the prior art

Method used

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  • Weak consolidation large pore channel treatment system as well as preparation method and application thereof
  • Weak consolidation large pore channel treatment system as well as preparation method and application thereof
  • Weak consolidation large pore channel treatment system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1. Stability experiment of weakly consolidated large pore channel governance system

[0072] Prepare several groups of systems to observe the stability, and use the sedimentation rate index to measure, the sedimentation rate = the sedimentation volume of the lower layer system / the volume of the upper layer water phase × 100%, the greater the sedimentation rate, the better the stability.

[0073] Sample 1: Add 10% curing agent to the mineralized water of the simulated oilfield formation, evenly disperse it, stir for 10 minutes, and pour it into a 100mL graduated cylinder;

[0074] Sample 2: Add 10% curing agent to the mineralized water of the simulated oilfield formation uniformly, stir for 10 minutes, and then add 0.15% tackifier and 0.8% support strengthening agent in sequence, add while stirring and continue stirring for 60 minutes. Pour into a 100mL graduated cylinder;

[0075] Sample 3#: Add 2% proppant to the mineralized water of the simulated oilfield f...

Embodiment 2

[0081] Embodiment 2, the preparation method of weakly consolidated large pore channel governance system

[0082] Sample 6#: Add 2% proppant to the mineralized water of the simulated oilfield formation uniformly, stir for 10 minutes, and then add 0.25% tackifier, 0.8% propping enhancer, and 6% curing agent in sequence, and add and mix while stirring. After stirring continuously for 60 minutes, pour into a 100mL graduated cylinder;

[0083] Sample 7#: Add 2% proppant to the mineralized water of the simulated oilfield formation uniformly, stir for 10 minutes, and then add 6% curing agent, 0.25% tackifier and 0.8% proppant enhancer in a uniform dispersion, add and stir while stirring. After stirring continuously for 60 minutes, pour into a 100 mL graduated cylinder.

[0084] The sedimentation data of the above samples are shown in Table 2 below.

[0085] Table 2 Settlement data table of different preparation sequence systems

[0086]

Embodiment 3

[0087] Example 3. The shape of the weakly consolidated large pore channel governance system

[0088] (1) Add 3% proppant to the mineralized water of the simulated oilfield formation by uniform dispersion, stir for 10 minutes, and then uniformly disperse and add 0.25% tackifier, 0.8% propping enhancer, and 10% curing agent successively, and continue to stir for 60 minutes;

[0089] (2) Take the prepared system in the above (1), put it in a beaker and let it stand for 72 hours, then take it out. See figure 2 ;

[0090] (3) Take the system configured in the above (1), inject it into the sand filling pipe (permeability 168 Darcy, diameter 2.5cm, length 100cm, 4 pressure measuring points), inject 1.8PV followed by water flooding, the production curve and See the schematic diagram of the permeability after plugging image 3 ;

[0091] (4) Take out the sand after the sand filling pipe is left standing for 72 hours, see Figure 4 ;

[0092] (5) After placing the sand taken out i...

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Abstract

The invention discloses a weak-consolidation large-pore-channel treatment system as well as a preparation method and application thereof, and belongs to the technical field of agents for profile control and water shutoff of oil fields. The weak-consolidation large-pore-channel treatment system is prepared from the following raw materials in percentage by mass: 1%-5% of a proppant, 0.2%-0.8% of a support enhancer, 2%-20% of a curing agent, 0%-0.5% of a tackifier and the balance of oilfield production sewage. Compared with an organic gel system, the weak-consolidation large-pore-channel treatment system has the advantages that the plugging strength is higher, and a certain space occupying function is achieved; and compared with a cement inorganic solidification system, the risk of blocking or polluting a production layer is reduced.

Description

technical field [0001] The invention relates to the technical field of an oil field profile control and water plugging agent, in particular to a weakly consolidated large pore channel treatment system and a preparation method and application thereof. Background technique [0002] The main influencing factors of the formation of large pores are the heterogeneity of the oil layer, the cementation strength and the production process. Especially in offshore unconsolidated sandstone reservoirs, long-term water flooding leads to the development of large pore channels, which reduces the oil displacement efficiency. Many Bohai oilfields belong to (extra) high porosity (extra) high permeability unconsolidated sandstone reservoirs, which are poorly cemented, undercompacted, and have high clay content. ; After long-term water flooding, clay swells, disperses, migrates, and may lead to sand migration, resulting in the development of (extra) large pores, and may even cause “super-large p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/508E21B43/267
CPCC09K8/514C09K8/5083C09K8/5045E21B43/267Y02W30/91
Inventor 胡科张健李先杰赵春花周文胜管错刘玉洋鲜若琨
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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